#preface {
  font-size: 80%;
}

.campaign {
  width: 324px;
}

#hokkyokusei.campaign {
  float: left;
}

#yozora.campaign {
  float: right;
}

.campaign h4 {
  margin-top: 0;
}

.campaign a img {
  display: block;
  margin: 0 auto;
}